The south portal of 6.5 Km long Karbude tunnel. This is the longest working tunnel on the Indian Railways. The tunnel has three ventilation shafts with blowers and control rooms placed equidistant at the top. The control rooms turn on the powerful blowers after the passage of the train to clear the smoke etc. The control room has inputs from the track circuit and air quality sensors to decide when the blowers should be switched on. They are also in touch with Bhoke station and with the many people inside the tunnel to take quick decisions regarding any situation. 18th April 2008